There really should be at least a stick thread on how to set up mining with a GPU.  Your advice and links really helped me get started.

I couldn't get any of the miners you suggested up and running (started up, but returned "could not retrieve work from RPC server"), so I went with a guiminer instead, and am now contributing to Deepbit at ~50 Mhash/s.

Thanks for the assistance.

I'm looking for some help getting started mining with my GPU.

I'm entirely new to the set-up and running of such a system, so if someone could give me some guidance, I'd appreciate it.

My PC is a Windows 7 64 bit, with an Nvidia GeForce460 and a Radeon X800GTO.  I use it primarily for gaming, so I'd like to constantly mine with the older card, while using the GeForce only when the computer is not in use.